Vision sensor chip with open-loop amplifier, operating method, and data processing system including same

A data processing system comprising:

• a vision sensor chip including vision sensor pixels and a processor controlling operation of the vision sensor chip,
• wherein each vision sensor pixel comprises:
• a photoelectric conversion element that generates a current in response to incident light;
• a current-voltage converter that converts the current into a corresponding voltage and provides the corresponding voltage at an output terminal;
• an AC coupling capacitor directly connected to the output terminal of the current-voltage converter that receives the corresponding voltage and generates an output voltage;
• an open-loop amplifier including a reset switch that amplifies the output voltage to generate an amplified output voltage;
• an event detection block that detects motion in relation to a change in the amplified output voltage and generates first and second detection signals;
• and
• a reset signal generator that generates a reset signal controlling operation of the reset switch in response to first and second control signals respectively related to the first and second detection signals.

A method of operating the vision sensor chip, comprising:

• converting a current generated based on an incident light into a voltage;
• communicating the voltage directly to an AC coupling capacitor;
• amplifying an output voltage provided by the AC coupling capacitor using an open-loop amplifier including the reset switch;
• detecting motion in relation to a change in the amplified output voltage and generating first and second detection signals in response to the detecting of motion;
• and
• controlling operation of the reset switch with first and second control signals respectively related to the first and second detection signals.